Here's some detailed information on the JBL 2341H. 3 inch aluminum diaphragm with (I'm guessing) a Kapton/Polyimide surround (photo of the diaphragm here). Bl=8N/A; Mmd=1.6g; Xmax=0.5mm.
JBL 435Be:
"Total moving mass was only 1 gram, with the diaphragm less than 0.5 grams.
This was less than a third the weight of previous materials."
And:
Density of Beryllium: 1,850 kg/m3, Titanium: 4,500 kg/m3 and Aluminium: 2,700 kg/m3.
"Total moving mass was only 1 gram, with the diaphragm less than 0.5 grams.
This was less than a third the weight of previous materials."
And:
Density of Beryllium: 1,850 kg/m3, Titanium: 4,500 kg/m3 and Aluminium: 2,700 kg/m3.
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Hi, just got a a-ha moment from sound depth perception cues and thought to leave it here since I think it could be a framework how to adjust the frequency response tilt to DI tilt/flatness which seems to be the big question how a optimized waveguide should behave. At least this is what I understood from mabats output week or two ago and no one has brought any light to this issue yet.
I haven't read much of how ear/brain perceives sound but it is mentioned in a study (google Auditory distance perception in humans: a review of cues, development, neuronal bases, and effects of sensory loss ) that the primary cues for sound depth perception are sound level, reverberation, and frequency. I think the answer lays somewhere in there, get the natural balance (for the brain) to perceive the reveberation (directivity) and balance and frequency (tilt) = natural sound, easy to process for the brain. At least the cues shouldn't contradict each other.
I think a constant directivity would be the way to go and frequency response tilt adjusted for the natural balance (for the brain) in the room, which would allow the recording to reveal its cues with minimal disturbance by the speaker/room playback system. I've got no idea what numbers are involved, what is the relation 😀 just a quick thought
I haven't read much of how ear/brain perceives sound but it is mentioned in a study (google Auditory distance perception in humans: a review of cues, development, neuronal bases, and effects of sensory loss ) that the primary cues for sound depth perception are sound level, reverberation, and frequency. I think the answer lays somewhere in there, get the natural balance (for the brain) to perceive the reveberation (directivity) and balance and frequency (tilt) = natural sound, easy to process for the brain. At least the cues shouldn't contradict each other.
I think a constant directivity would be the way to go and frequency response tilt adjusted for the natural balance (for the brain) in the room, which would allow the recording to reveal its cues with minimal disturbance by the speaker/room playback system. I've got no idea what numbers are involved, what is the relation 😀 just a quick thought
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I just did an interview for a web blog in audio. In it I gave a plug for this thread. (a link will be posted.) In a little while when the blog posts, we should see a huge influx of participants. Hope this doesn't wreak things!!!
Hopefully it will result in some more big waveguide builds. Almost 4600 replies and only a few builds so far 🙂
Turk, You've mentioned in this thread that you enjoy the occasional glass of scotch. Have you started early today?
If anyone wants to design a baffle with a 12" - 15" axisymetric WG like Marcel has shown, (WG ends basically where the 3/4" roundover edge begins) then I'll try to CNC and build a speaker with it. I've been trying to put together a project behind the scenes for a bit.
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In that case, the most shocking thing I learned is that Turk 182 thinks OSWGs are eye-candy. Visually, I always considered them a necessary evil.